What are timars?

Some articles on timars:

Administrative Divisions Of The Ottoman Empire - Lower-order Administrative Units
... livas) governed by sanjakbeys (also called Mutesarrifs) and were further subdivided into timars (fiefs held by timariots), kadiluks (the area of responsibility of a judge, or Kadı) and ... and Al-Hasa (the salyane provinces) were not subdivided into sanjaks and timars ...